Efficient Low‐Bandgap Polymer Solar Cells with High Open‐Circuit Voltage and Good Stability

A novel D-A1-D-A2-type polymer that exhibits a small bandgap of 1.43 eV yet still yields polymer solar cells with a high open-circuit voltage (VOC) of 0.81 V and power conversion efficiencies of up to 8.63% is reported. Comparable efficiencies can be achieved even when the active layer is processed in air or after it is thermally annealed at 150 °C. As a service to our authors and readers, this journal provides supporting information supplied by the authors. Such materials are peer reviewed and may be re-organized for online delivery, but are not copy-edited or typeset. Technical support issues arising from supporting information (other than missing files) should be addressed to the authors. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.